U.S. patent number 4,456,794 [Application Number 06/384,977] was granted by the patent office on 1984-06-26 for fastening arrangement for a handset case halves.
This patent grant is currently assigned to Telefonaktiebolaget LM Ericsson. Invention is credited to Jorgen F. Lindberg, Carl-Axel Stromer, Erling Tronslien.
United States Patent |
4,456,794 |
Stromer , et al. |
June 26, 1984 |
Fastening arrangement for a handset case halves
Abstract
A fastening arrangement to keep together the parts of a handset
consisting of two case halves. The microphone and/or the telephone
receiver is kept in position in the case by a clamping element upon
pressing the two case halves towards each other. The clamping
element is provided with a gliding surface which is close to a
support in the case half towards which the microphone or the
telephone receiver is to be kept and when pressing the two halves
together, the clamping element is pressed diagonally downwards. At
this movement the clamping element grips a flange in the upper case
half and presses it downwards, so that the case halves are securely
kept together.
Inventors: |
Stromer; Carl-Axel (Bromma,
SE), Tronslien; Erling (Tyreso, SE),
Lindberg; Jorgen F. (Stockholm, SE) |
Assignee: |
Telefonaktiebolaget LM Ericsson
(Stockholm, SE)
|
Family
ID: |
20339970 |
Appl.
No.: |
06/384,977 |
Filed: |
June 4, 1982 |
PCT
Filed: |
November 06, 1980 |
PCT No.: |
PCT/SE80/00280 |
371
Date: |
June 04, 1982 |
102(e)
Date: |
June 04, 1982 |
PCT
Pub. No.: |
WO82/01632 |
PCT
Pub. Date: |
May 13, 1982 |
Current U.S.
Class: |
379/433.01;
379/433.03; 379/440; D14/248 |
Current CPC
Class: |
H04M
1/03 (20130101) |
Current International
Class: |
H04M
1/03 (20060101); H04M 001/03 () |
Field of
Search: |
;179/103,102,1R,1C,1D,1L,178,179 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Other References
Telephone Handset, H. D. Bales et al., Western Electric Technical
Digest, No. 65, Jan. 1982, pp. 1-2..
|
Primary Examiner: Pitts; Harold I.
Assistant Examiner: Dwyer; James L.
Attorney, Agent or Firm: Roberts, Spiecens & Cohen
Claims
What we claim is:
1. A handset comprising a lower case part adapted for receiving a
transducer, an upper case part, fastening means for joining the
upper and lower case parts together and clamping means engaging
said parts for pressing said parts together upon tightening of said
fastening means while pressing said transducer against the lower
case part, said clamping means including a clamping body acted on
by said fastening means during tightening thereof to be displaced
from an initial position to a displaced position, said clamping
body having a sliding surface and one of said case parts including
a support on which said sliding surface travels during tightening
of said fastening means, said clamping body including projection
means spaced from said sliding surface which is moved along a
diagonal path as said clamping body travels to said displaced
position, said upper case part including flange means facing said
projection means on said clamping body for being engaged by said
projection means to clamp said case parts together when the
clamping body has been moved to its displaced position, said
clamping body further including means for pressing said transducer
against said lower case part when said clamping body has been moved
to its displaced position concurrently with the clamping of the
case parts together by the projection means and the flange
means.
2. A handset as claimed in claim 1 wherein said clamping body is of
U-shape with opposed legs on which said projection means are
mounted.
3. A handset as claimed in claim 1 wherein said means for pressing
said transducer against said lower case part comprises a resilient
arm extending from said clamping body and undergoing resilient
deformation upon displacement of the clamping body.
4. A handset as claimed in claim 1 comprising guide means on said
clamping body for guidably holding said clamping body during the
displacement thereof to prevent movement transverely of said
displacement.
5. A handset as claimed in claim 1 wherein said clamping body
includes second projection means engaged in holes provided in said
lower case part for being displaced and guided in said holes as the
clamping body undergoes its displacement.
6. A handset as claimed in claim 1 wherein said support comprises a
collar on one of said case parts, said sliding surface on the
clamping body being angulated relative to said collar on which it
rides to cause said clamping body to travel along said diagonal
path.
7. A handset as claimed in claim 6 comprising a first stud on said
collar, a second stud on the other of the case parts, said second
stud having a guide hole in which said first stud travels as said
fastening means is tightened.
8. A handset as claimed in claim 7 wherein said fastening means
comprises a fastener abutting said collar and threadably engaged in
said second stud, said second stud abutting against said clamping
body.
9. A handset as claimed in claim 1 wherein said case parts include
a hinge means at an end remote from the clamping means.
Description
FIELD OF THE INVENTION
The present invention relates to a fastening arrangement to keep
together the parts of a handset consisting of two case halves.
DESCRIPTION OF PRIOR ART
It is previously known to construct handsets consisting of two case
halves, a lower case part and an upper case part, which are kept
together by means of screws in the hand gripping part. When
mounting, the microphone and the telephone receiver are placed in
the lower part, the upper case half being hooked at one of the
short ends of the lower part and the screws in the hand gripping
part being tightened, whereby the two case halves are pressed
towards each other. By tightening the screws the microphone and the
telephone receiver are also pressed against the bottom of the lower
part by means of clamping rings or straps. Depending on the
distance between the fastening screws and the end of the case where
the halves are to be pressed together, bending strains with
associated cracks can arise.
SUMMARY OF THE INVENTION
An object of the invention is to provide an arrangement eliminating
the mentioned bending strains by firmly keeping together the remote
ends of the case halves.
In accordance with the above and further object of the invention, a
clamping means is provided for engaging upper and lower case parts
of a telephone receiver to press the parts together upon tightening
of a fastening means while concurrently pressing a microphone
and/or a telephone receiver against the lower case part.
The clamping means includes a clamping body acted on by the
fastening means during tightening thereof so as to be displaced
from an initial position to a displaced position.
The clamping body has a sliding surface which rides on a support on
one of the case parts during tightening of the fastening means
Additionally, the clamping body has projections spaced from the
sliding surface which are moved along a diagonal path as the
clamping body travels to its displaced position to engage flanges
on the upper case part to clamp the case parts together when the
clamping body has been moved to its displaced position.
The clamping body further includes a projection for pressing the
microphone and/or receiver against the lower case part when the
clamping body has been moved to its displaced position in
concurrence with the clamping of the case parts together by the
engagement of the projections with the flanges.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully described below by means of an
embodiment and with reference to the accompanying drawing in
which
FIG. 1 is an elevational view, partly in section, of a hand set
according to the invention upon fastening,
FIG. 2 shows the same set after the fastening,
FIG. 3 shows in a cross-section, taken on line III--III in FIG. 6,
the microphone end of the hand set upon mounting,
FIG. 4 shows the same arrangement as FIG. 3 in a mounted state,
FIG. 5 shows the lower case half with a clamping strap in a planar
view partly in section and
FIG. 6 shows the hand set as seen from the microphone end, partly
in section.
PREFERRED EMBODIMENT
The upper case half of the handset is designated 1 in FIG. 1 and
the lower case half is designated 2. At one of its short ends the
lower half or part is provided with a groove 3 into which a hook 4
on the upper half or part can engage, so that a turning point is
attained around which the upper part can revolve until the opposite
end in close contact with the end of the lower part.
In previously known handsets, the fastening has been carried out by
means of screws which when tightened cause the two case halves to
be pressed towards each other while a clamping ring or a strap
presses a transducer constituted by a microphone and/or a telephone
receiver, respectively, against the bottom of the lower case half.
However, when pressing the ends of the case halves together by
means of the screws, a considerable bending strain arises due to
the distance between the screws and the end of the casing which can
result in cracks. This is prevented by a clamping strap 6 according
to the invention which is schematically indicated in FIG. 1 and
whose purpose is not only to keep the microphone and/or the
telephone receiver pressed against the bottom of the lower case
half, but also to keep the two case halves pressed towards each
other at one of their short ends. The clamping strap has two pairs
of studs 7 and 8 at the short side of the handset which when
tightening the case halves together are pushed outwards, one of the
pairs 18 slipping into the lower case half 2 through the guide
openings 25 at the same time as the pair of studs 19 is pushed
diagonally downwards in order to engage a flange part 24 on the
inside of the upper case half. Thus, the upper case half is pressed
towards the lower one and is kept in a stable position so that
bending strains are prevented as will be explained in greater
detail below.
FIGS. 3 and 4 show the clamping strap and its function in
connection with the fastening of the upper and the lower case
halves. The lower case half 2 has a stud 11 extending inwards with
a collar 12. Oppositely, on the upper case half, a stud 13
extending inwards is provided with a hole 14 for the stud 11 and is
provided with a thread 15 into which screw 5 can be screwed in
order to bring the two case halves closer together by tightening.
The clamping strap 6 shown in FIG. 5 in an end view is of U-shape
and comprises a body 16 with fork-shaped end 17, which grips around
the stud 11 and, when the strap extends in the lower case half when
mounting, is approximately on a level with the upper edge of the
stud 11. The legs of the body 16 of the clamping strap are provided
with pairs of claws 18 and 19, respectively, of which the claws 18,
upon mounting, engage into holes 25 in the lower case half as it
appears from FIGS. 3 and 5. The clamping strap is also provided
with two projections 20 directed downwards whose purpose is to keep
the microphone 21 in a pressed down position. Furthermore, the
clamping strap is provided with a resilient arm 22 which
elastically obstructs a displacement of the strap in a downward
direction. Between the fork-shaped end of the clamping strap and
the shanks there is a connection arm 23 forming an obtuse angle
with these two parts, a slipping surface 24' on the inner side of
the connection arm being in close contact with the collar 12. If
now, after placing the strap 16 between the case halves as shown in
FIG. 3, the screw 5 is tightened, the stud 11 is inserted into the
hole 14, whereby the lower surface of the stud 11 exerts pressure
against the fork 17 and the sliding surface 24' sliding alongside
the edge of the collar 12. In this way the clamping strap 16 is
pressed diagonally downwards with electric deformation of the arm
22 as it appears from FIG. 4. At the position according to FIG. 3,
the strap 16 does not engage the upper case half, more
specifically, the pairs of claws 19 are not in close contact with
the flanges 24 on the inner side of the upper case half. FIG. 3
shows the position before the tightening of the screw 5 has
started. In reality, however, the upper case half is already
pressed down sufficiently so that the claws 19 are in a position
higher than the flanges 24 when beginning the tightening of the
screw. When, during the tightening, the clamping strap 16 is
displaced diagonally downwards, the pairs of claws 19 grips over
the flange 24 and presses this downwards at the same time as the
pair of claws 18 is guided through the hole 25 in the outgoing
direction. When the screw 5 is tightened, the two halves are
completely locked relatively to each other and play or bending
strains cannot arise. In FIG. 4 the wall part 26 (FIG. 3) has been
removed to illustrate the position of the flange 24 after the
locking.
* * * * *